Large M25 taps with two thread pitches...

[Aorus Forever]

I came across two rather large metric taps...

M25 x 0.50
and
M25 x 0.75

And I was wondering if there are any use cases for them in making laser hosts???
I know they can't be cheap at this size...

 

[zigzag123]

I came across two rather large metric taps...

M25 x 0.50
and
M25 x 0.75

And I was wondering if there are any use cases for them in making laser hosts???
I know they can't be cheap at this size...

Have you bought them or thinking about it?
Is it a 2 set tap and die or just the tap?

If its a tap it ptrobably needs to be a flat bottom tap..and then you need to find a OD die..

 

[Aorus Forever]

I have them...

They are two taps, they aren't flat bottom taps, but the thread pitch is so small they have hardly any tapered approach/starting taper...

I was just wondering if there is any use for them among the laser community?

 

[zigzag123]

You can always grind down the tip of the tap a little "if needed" on a surface grinder.
Oh I think they can be used for sure. The M25 x .75 might be to fine?? but i'm not sure.

I would go on ebay to see how much the die's go for.

 

[RedCowboy]

It's a stupid question, it's like saying I found these two sockets, I wonder if they would be useful in building cars.
You don't build a car around a couple of sockets.

You don't buy aluminum bar stock based on your two taps, you buy a tap and die set so that you can accommodate various bar stock diameters based on your battery size and component size.

Better yet you don't use taps at all, you use a lathe.

 

[zigzag123]

It's a stupid question, it's like saying I found these two sockets, I wonder if they would be useful in building cars.
You don't build a car around a couple of sockets.

You don't buy aluminum bar stock based on your two taps, you buy a tap and die set so that you can accommodate various bar stock diameters based on your battery size and component size.

Do you think its safe to say that they might work on only "1 inch" or "25mm" OD round stock and really nothing else. Unless you machine down bigger stock on the switch end cap or the front?

 

[zigzag123]

It's a stupid question, it's like saying I found these two sockets, I wonder if they would be useful in building cars.
You don't build a car around a couple of sockets.

You don't buy aluminum bar stock based on your two taps, you buy a tap and die set so that you can accommodate various bar stock diameters based on your battery size and component size.

Better yet you don't use taps at all, you use a lathe.

It would be Super Nice to have a CNC that threads and taps..
Years and years ago I worked with 3 Axis Miyano, I loved how the cutting tools backed off after maching and didn't leave a score mark when coming back..

 

[RedCowboy]

Do you think its safe to say that they might work on only "1 inch" or "25mm" OD round stock and really nothing else. Unless you machine down bigger stock on the switch end cap or the front?

You can't thread 25mm bar with a 25mm tap as taps cut inner threads, 1 inch is 25.4mm so it's too small as well, but you could tap into 1.25 inch or 30mm, but that would be for larger builds such 21700 battery builds but not 26650 battery size builds.

 

[zigzag123]

You can't thread 25mm bar with a 25mm tap as taps cut inner threads, 1 inch is 25.4mm so it's too small as well, but you could tap into 1.25 inch or 30mm, but that would be for larger builds such 21700 battery builds but not 26650 battery size builds.

Oh, I kinds mixed up the words..
I would guess depending if you got a solid piece of Brass or Aluminum or a hollow piece you would need machine a undercut in the inside for the tap and need to machine down?? the outside and thread it so both the end cap and host are flush together.??

I don't have a machinist chart near me anymore that gives the specs on what to cut both ID or OD for each Tap and Die size.

 

[RedCowboy]

You're talking about a tap, not a die, so your workpiece needs to be wider than the tap by enough to leave a sidewall, so a 25mm OD (outer dia.) is too small and 1 inch is 25.4mm so .4mm would get destroyed by the tap.

Now 25mm ID ( inner dia. ) hollow tube would be ok as long as the wall thickness was appropriate for your needs, but your threads wouldn't be very deep.
However a 25mm ID tube is too wide for a 21700 and too small for a 26650
Maybe for taping an endcap for a 21700 build.

Maybe you originally meant a 25mm ID hollow round bar ?
If so depending on the tap tolerance and the bar, then maybe, as long as the threads were deep enough not to strip out, also the thread pitch determines your drill size or ID

It would likely be too loose to use an M25 in an 25mm ID tube, a 24mm ID would be better so your threads have some depth.

The right size hole for a 25mm tap is HERE

 

[Encap]

So in short those taps are not useful in making lasers pointers for several reasons ---threads size to small and not robust enough + due to the need to use a tube that fits the battery size you want to use. New tap and die sets of the correct size and a stronger thread for a pointer build are not expensive.

Maybe put them on Ebay is you want to sell them

 

[zigzag123]

You're talking about a tap, not a die, so your workpiece needs to be wider than the tap by enough to leave a sidewall, so a 25mm OD (outer dia.) is too small and 1 inch is 25.4mm so .4mm would get destroyed by the tap.

Now 25mm ID ( inner dia. ) hollow tube would be ok as long as the wall thickness was appropriate for your needs, but your threads wouldn't be very deep.
However a 25mm ID tube is too wide for a 21700 and too small for a 26650
Maybe for taping an endcap for a 21700 build.

Maybe you originally meant a 25mm ID hollow round bar ?
If so depending on the tap tolerance and the bar, then maybe, as long as the threads were deep enough not to strip out, also the thread pitch determines your drill size or ID

It would likely be too loose to use an M25 in an 25mm ID tube, a 24mm ID would be better so your threads have some depth.

The right size hole for a 25mm tap is HERE

Yup I didn't think this through to well
I was thinking a flush type of fit between the host and tail cap.. I can blame it on age but thats a copout.

Thanks for the pic and the chart.. Let me get my bearing together.. as i'm embarrased big time!

 

[RedCowboy]

It's all good my friend.